Engine exhaust system



A. E. KOLBE ENGINE EXHAUST SYSTEM April 17, 1962 3,029,597

Filed Oct. 1, 1959 2 Sheets-Sheet 1 IN VEN T OR.

ATTORNEY April 17, 1962 A. E.,KOLBE ENGINE EXHAUST SYSTEM 2 Sheets-Sheet 2 Filed 000. l, 1959 IN VEN TOR. idea/fie!) (Zia/A4 ATTORNEY ttes Delaware Filed Oct. 1, 1959, Ser. No. 843,666 3 Claims. (Cl. 60-29) This invention relates to exhaust systems for engines, particularly for air cooled 180 opposed cylinder internal combustion engines for automotive and other purposes.

It is proposed to provide an exhaust system for an engine having a plurality of cylinders and in which there is flexibility between the exhaust manifold and the head for the cylinders, thus providing for dilference in expansion rates between the exhaust manifold and the head.

It is also proposed to provide an exhaust system which will be simple, inexpensive and easy to assemble and remove, thereby providing an engine that will be easy to manufacture and service.

In the drawings:

FIGURE 1 is a fragmentary cross sectional view of an internal combustion engine having an exhaust system embodying the invention.

FIGURE 2 is a fragmentary side elevational view of the engine disclosed by FIGURE 1. FIGURE 2 is taken substantially in the plane of lines 2-2 on FIGURE 1, looking in the direction of the arrows thereon.

The engine embodying the invention has a crankcase 11 in which a crankshaft 12 is rotatably mounted. The crankshaft 12 operates pistons 13 reciprocably mounted in cylinders 14, the outer ends of which are closed by heads 16. The heads and cylinders are adapted to be secured to the crankcase 11 by bolts 17. The pistons 13 are operatively secured to the crankshaft 12 by connecting rods 18. The cylinders 14 have combustion chambers 19 in which combustible charges may be compressed and ignited and expanded and exhausted through valves 21 controlling the admission and exhaust of the charges and the products of combustion. Each cylinder may have an inlet valve and an exhaust valve for this purpose.

The exhaust valves control exhaust passages 22 which are formed in the heads 16 and which communicate with an exhaust manifold 23 through flexible sheet metal or other suitable tubes 24. The heads 16 are formed in the passages 22 to provide annular shoulders 26 which are engaged by the ends of the tubes 24 to provide abutment means against which the tubes 24 may be secured in the heads. The tubes 24, if desired, may be pressed into the heads, thereby compressing the tubes to secure the tubes in the passages 22. The opposite ends of the tubes 24 may have abutment means 27 thereon in the form of collars having tapered flanges and being welded or otherwise secured to the tubes 24. The ends of the tubes 24 are adapted to project into openings 28 that are formed in the manifolds 23 opposite the passages 22 in the heads 16. The manifolds 23 also are formed to provide outwardly tapering abutment means 29 which is formed opposite the abutment means 27 on the tubes 24. The abutment means 27 is adapted to engage the abutment means 29 through packing 31. The tubes 24 are adapted to be compressed between the heads 16 and the manifolds 23 by flexible clamping means indicated at 32. The clamping means 32 may be made of sheet metal or other suitable stampings that will bend slightly in response to the axial expansion and contraction of the tubes 24 and the parts between which the tubes are secured. The clamping means 32 may be in the form of levers or brackets having ends engaging the manifolds 23 opposite the tubes 24 and having ends engaging the heads 16. The levers are adapted to be secured to the heads 16 by bolts 33 extending through the levers between the head and the manifold engaging ends thereof. The valves 21 are normally held closed by springs 34 and are opened by rocker arms 36 secured to the heads 18 on rocker arm supports 37. The rocker arms 36 are actuated in timed relation to the operation of the crankshaft by push rods 38 and valve lifters 39 and a camshaft 41 also rotatably mounted in the crankcase 11 and driven by the crankshaft 12.

The principal parts of the frame of the engine 10 may be made of any suitable metal but in the present instance it is proposed to make the crankcase of aluminum, the cylinders of cast iron, the heads 16 of aluminum, and the manifolds 23 of cast iron. In the present instance the engine 10 is an air cooled engine thereby having fins formed on the cylinders 14 and the heads 16 for dissipating the rejected heat of the engine.

It will be apparent from FIGURE 2 that the heads 16 and the manifolds 23 may expand and contract lengthwise at different rates, due to the different metals that may be employed and due to the rate and extent of heating of these parts. Also, looking at FIGURE 1 it will be apparent that the tubes 24 and the parts of the heads supporting the rocker arms 36 and to which the levers or brackets 32 are secured may expand and contract due to the difference in the metals of which they may be constructed and due to the difference in heating and in the rate of heating of these parts. It will be apparent that if the heads and the manifolds expand and contract differently they will tend to bend the flexible tubes 24, which are long enough to stand such bending without undue strain. It will be apparent from FIGURE 1 that if the outer walls of the heads and the tubes 24 expand and contract at different rates they will bend the brackets or levers 32. During all such bending the manifolds 23 will remain tightly sealed with respect to the passages 22 in the heads 16 and the exhaust gas will be carried from the cylinders in a proper manner.

I claim:

1. An exhaust system for an internal combustion engine having a row of cylinders and a head for said cylinders and with said head having exhaust passages formed therein for discharging exhaust gas from said cylinders and resulting from the operation of said engine and comprising, an exhaust manifold extending along one side of said head and having openings therein opposite said passages in said head, flexible tubes extending into said passages in said head and said openings in said manifold, said head and said manifold having outwardly facing abutment means formed therein around said passages in said head and said openings in said manifold, said flexible tubes having abutment means formed thereon and engaging said outwardly facing abutment means of said manifold and said head, flexible clamping means extending along said manifold in opposed relation to said flexible tubes, and means securing said flexible clamping means to said head and in engagement with said manifold, said flexible clamping means applying forces along the length of said manifold and against said abutment means and tending to compress said flexible tubes between said manifold and said head, said flexible tubes tending to bend in response to the expansion of said manifold and said head and resulting from the operation of said engine, said flexible clamping means tending to bend in response to the expansion of said tubes and said manifold and said head and resulting from the operation of said engine.

2. An exhaust system for an internal combustion engine having a row of cylinders and a head for said cylinders and with said head having exhaust passages formed therein for discharging exhaust gas from said cylinders resulting from the operation of said engine and compris ing, an exhaust manifold extending along one side of said head and having openings therein opposite said passages in said head, said head having tubes extending from said passages in said head into said openings in said manifold, said manifold having outwardly facing abutment means formed therein around said openings in said manifold, said tubes having abutment means formed thereon and engaging said outwardly facing abutment means of said manifold, flexible clamping means extending along said manifold in opposed relation to said tubes, and means securing said clamping means to said head and in engagement with said manifold, said flexible clamping means applying forces along the length of said manifold and against said abutment means and tending to compress said tubes between said manifold and said head, said flexible clamping means tending to bend in response to the expansion of said tubes and said manifold and said head and resulting from the operation of said engine.

7 3. An exhaust system for an internal combustion engine having a row of cylinders and a head for said cylinders and with said head having exhaust passages formed therein for discharging exhaust gas from said cylinders resulting from the operation of said engine and comprising, an exhaust manifoldextending along one side of said head and having tubes communicating with said manifold and extending therefrom opposite said passages in said head, said head having outwardly facing abutment means formed therein around said passages in said head, said tubes having abutment means formed thereon and engaging said outwardly facing abutment means of said head, flexible clamping means extending along said manifold in opposed relation to said tubes, and means securing said clamping means to said head and in engagement with said manifold, said flexible clamping means applying forces along the length of said manifold and against said abutment means and tending to compress said tubes between said manifold and said head, said flexible clamping means tending to bend in response to the expansion of said tubes and said manifold and said head and resulting from the operation of said engine.

7 References Cited in the file of this patent UNITED STATES PATENTS 1,004,564 Gaskill -2 Oct. 3, 1911 2,289,083 Stortz July 7, 1942 2,547,454 Flint Apr. 3, 1951 2,611,238 Fryer Sept. 23, 1952 2,678,530 Jacobs May 18, 1954 2,685,166 Hasbrouck et al. Aug. 3, 1954 FOREIGN PATENTS 548,242 Canada Nov. 5, 1957 

